Event

I will discuss the rather striking situation that confronts us in the context of conventional string phenomenology: 3 spatial dimensions are of Hubble size and 6 other ones are of sizes much smaller than known particle physics length scales. I explain that this is essentially the cc problem in a different jacket. Then I will go on to explain how we might tunnel into such unnatural vacua by starting off with "one-dimensional" vacua that have all spatial dimensions of the same size. In the second part of my talk I will present some of the latest insights on whether it is even achievable in string theory to construct vacua with stabilised modes that have a hierarchy between the sizes of spatial dimensions (scale separation) and how this poses an excellent problem for holography.